This article is not for anything about hacking password-protected files. You should know the original password of the file to remove the password or change the password to your password. You don’t need to use any paid application or hacking trick to remove the password from the password-protected PDF. The first step is to open the protected PDF file using Mac Preview App with the password already given for the file.
Please take a look at this article to Convert Any Webpage to a Clean PDF in Mac. You can add a password for any file, and you can refer instructions in this article It’s Easy to Add Password to PDF Files using Mac.
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